diatom

American  

[dahy-uh-tuhm, -tom] / ˈdaɪ ə təm, -ˌtɒm /

noun

1. any of numerous microscopic, unicellular, marine or freshwater algae of the phylum Chrysophyta, having cell walls containing silica.

---

diatom British  

/ -ˌtɒm, ˈdaɪətəm /

noun

1. any microscopic unicellular alga of the phylum Bacillariophyta , occurring in marine or fresh water singly or in colonies, each cell having a cell wall made of two halves and impregnated with silica See also diatomite

---

diatom Scientific  

/ dī′ə-tŏm′ /

1. Any of various one-celled aquatic organisms of the class Bacillariophyceae that have hard bivalve shells (called frustules) composed mostly of silica, can perform photosynthesis, and often live in colonies. They make up a large portion of the marine plankton and are an important food source for many aquatic animals. The skeletal remains of diatoms are the main constituent of diatomite.

---

Etymology

Origin of diatom

1835–45; < New Latin Diatoma originally a genus name, feminine noun based on Greek diátomos cut in two. See dia-, -tome

Example Sentences

For seven weeks, the team will slowly melt the hard-won ice, releasing ancient dust, volcanic ash, and even tiny marine algae called diatoms that were locked inside when water turned to ice.

From BBC

“Those diatoms in that diatomite is what gives rise to the oil in Los Angeles” and the automobile and aeronautical industries, Hendy said.

From Los Angeles Times

Diatomaceous earth, a powder made from fossilized diatoms, dries out the exoskeletons of roaches.

From Salon

It’s also a perfect recipe for creatures like sardines and anchovies, who feast on the diatoms, algae and phytoplankton in these cool, nutrient-rich waters.

From Los Angeles Times

Comparing the findings of the 1964 earthquake core samples to samples deeper in the coastal stratigraphy, the research team discovered sedimentary and diatom evidence of three other instances where the splay fault ruptured.

From Science Daily